<?php
/**
 * Zend Framework
 * LICENSE
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 * @category Zend
 * @package Zend_Validate
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 * @version $Id: Ccnum.php 24593 2012-01-05 20:35:02Z matthew $
 */
/**
 *
 * @see Zend_Validate_Abstract
 */
require_once 'Zend/Validate/Abstract.php';

/**
 *
 * @category Zend
 * @package Zend_Validate
 * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license http://framework.zend.com/license/new-bsd New BSD License
 */
class Zend_Validate_Ccnum extends Zend_Validate_Abstract {

    /**
     * Validation failure message key for when the value is not of valid length
     */
    const LENGTH = 'ccnumLength';

    /**
     * Validation failure message key for when the value fails the mod-10 checksum
     */
    const CHECKSUM = 'ccnumChecksum';

    /**
     * Digits filter for input
     * @var Zend_Filter_Digits
     */
    protected static $_filter = null;

    /**
     * Validation failure message template definitions
     * @var array
     */
    protected $_messageTemplates = array(self::LENGTH => "'%value%' must contain between 13 and 19 digits", self::CHECKSUM => "Luhn algorithm (mod-10 checksum) failed on '%value%'");

    public function __construct () {
        trigger_error ('Using the Ccnum validator is deprecated in favor of the CreditCard validator');
    }

    /**
     * Defined by Zend_Validate_Interface
     * Returns true if and only if $value follows the Luhn algorithm (mod-10 checksum)
     * @param string $value
     * @return boolean
     */
    public function isValid ($value) {
        $this -> _setValue ($value);
        if (null === self::$_filter) {
            /**
             *
             * @see Zend_Filter_Digits
             */
            require_once 'Zend/Filter/Digits.php';
            self::$_filter = new Zend_Filter_Digits ();
        }
        $valueFiltered = self::$_filter -> filter ($value);
        $length = strlen ($valueFiltered);
        if ($length < 13 || $length > 19) {
            $this -> _error (self::LENGTH);
            return false;
        }
        $sum = 0;
        $weight = 2;
        for ($i = $length - 2; $i >= 0; $i -- ) {
            $digit = $weight * $valueFiltered[$i];
            $sum += floor ($digit / 10) + $digit % 10;
            $weight = $weight % 2 + 1;
        }
        if ((10 - $sum % 10) % 10 != $valueFiltered[$length - 1]) {
            $this -> _error (self::CHECKSUM, $valueFiltered);
            return false;
        }
        return true;
    }

}
